US4218065A - Arrangement for centering, aligning and retaining a rotating record - Google Patents

Arrangement for centering, aligning and retaining a rotating record Download PDF

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Publication number
US4218065A
US4218065A US05/972,603 US97260378A US4218065A US 4218065 A US4218065 A US 4218065A US 97260378 A US97260378 A US 97260378A US 4218065 A US4218065 A US 4218065A
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US
United States
Prior art keywords
disc
drive spindle
centering
arrangement
operating position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US05/972,603
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English (en)
Inventor
Willem VAN DER Hoek
Eduard Camerik
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US Philips Corp
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US Philips Corp
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Publication date
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0284—Positioning or locking of single discs of discs rotating during transducing operation by clampers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details

Definitions

  • the invention relates to an arrangement for centering, aligning and retaining a rotary rigid disc-shaped record carrier with a central disc hole in an operating position, and relates in particular an arrangement for centering, aligning and retaining an optically readable video disc, the arrangement comprising: a drive spindle with a free end, which spindle is rotatable about an axis of rotation; a centering device disposed on the drive spindle near its free end, which device cooperates with the wall of the central disc hole in the operating position of the disc; a disc-aligner which is mounted on the drive spindle for aligning the disc in its operating position in a plane perpendicular to the axis of rotation of the drive spindle and provided with one or more supporting surfaces for the disc; as well as a disc loader which is movable to a position opposite the centering device and which presses on a disc in the operating position for retaining the disc in position in conjunction with the supporting surfaces of the disc aligner.
  • the centering device of this player comprises a centering member in the form of a centering cone, comprising a truncated cone which is rigidly mounted on the drive spindle.
  • the disc-aligner comprises a flange which rotates along with the drive spindle, but which is axially movable relative to the centering cone and slidably guided on the drive spindle. When a video disc is put on, it is centered relative to the axis of rotation of the drive spindle with the aid of the centering cone.
  • the weight of the video disc causes the disc aligner to be lowered against a slight resilient action until the wall of the disc hole of the video disc makes contact with the centering cone surface.
  • the disc aligner ensures a correct alignement of the video disc at right angles to the axis of rotation of the drive spindle, but does not prevent the wall of the disc hole from engaging with the surface of the centering cone.
  • the disc loader is magnetically urged towards the cone and presses the wall of the disc hole against the surface of the centering cone with such a force that, while the disc aligner also exerts a certain friction on the video disc as a result of the resilient action, a friction torque is produced of a magnitude which suffices for starting, for rotation during operation and for braking the video disc.
  • a disadvantage of these and similar arrangements for centering, aligning and retaining a disc is that the axial position of the disc on the disc spindle is not predetermined, because in practice the disc-hole diameters of different discs vary. Owing to the comparatively small taper of the centering cone said diameter variations lead to variations in the axial position of the disc on the drive spindle which are approximately 4 ⁇ as large.
  • a video disc player with discs having an outer diameter of 30 cm and a disc-hole diameter of approximately 35 mm may then cause variations in the axial position of the disc on the drive spindle of approximately 700 microns in total.
  • the variations in disc-hole diameter may be caused by manufacturing tolerances and by influences of the ambient temperature and humidity.
  • Another drawback of the known construction is that for the axial movability of the disc aligner guidance of the disc aligner on the drive spindle is necessary. As a result of the inevitable play in the guidance of the disc aligner a certain residual misalignment in the position of the disc may occur.
  • the video disc rotates with a speed of 25 or 30 Hertz, depending on the system used for coding the information on the disc, so that the residual misalignment manifests itself in a positional inaccuracy which recurs at a rate of 25 or 30 Hertz at the location of the point where the information on the disc is read with the aid of optical means.
  • the focussing of the light beam which is used should be accurate within 1 ⁇ m
  • a servo system for the focussing of the light beam there is provided, as previously stated, a servo system for the focussing of the light beam.
  • the residual misalignment constitutes an additional source of errors for the focussing servo.
  • the misalignment contributes to the inaccuracy in the centering of the disc.
  • a tracking servo for which the information tracks should preferably be centered with an accuray of better than 50 microns.
  • the residual misalignment may give rise in itself to a centering error of 15 microns.
  • the object of the invention to provide an arrangement of the type mentioned in the preamble, which ensures a correct centering of the disc, even in the case of local irregularities in the wall of the disc hole, and which furthermore guarantees an excellent axial positioning and alignment of the disc.
  • the invention is characterized in that the disc aligner is rigidly connected to the drive spindle, that the centering device comprises a plurality of centering members which are radially movable between a rest position and an operating position which is situated nearer the axis of rotation, and that there are provided resilient means for urging the centering members towards their rest positions, the centering members being movable against the action of the resilient means by cooperation with the wall of the disc hole when the disc is placed onto the drive spindle.
  • the disc aligner is rigidly connected to the drive spindle and may for example comprise a fixed flange, while the radially movable centering members ensure a correct centering of the disc.
  • the radially movable centering members ensure a correct centering of the disc.
  • a multitude of movable centering members are employed, because this minimizes the influence of local irregularities in the disc-hole wall on the centering of the disc, whilst furthermore a comparatively small resilient force is required for each centering member in order to ensure correct centering of the disc.
  • plastic deformations of the disc-hole wall are prevented.
  • An embodiment of the invention which is particularly favorable because many resilient means can be accommodated adjacent each other in the available limited space is characterized in that the resilient means comprise bar springs which are integral with the centering members, which springs are connected to the drive spindle by a fixed end.
  • a further embodiment is of importance to facilitate placing a disc onto the drive spindle and is characterized in that the bar springs, at least on a side which faces away from the axis of rotation of the drive spindle, have a kinked shape, so that on a side which is disposed nearer the free end of the drive spindle the bar springs together constitute an interrupted truncated cone in the rest position, which cone has a transverse dimension which varies from smaller than to greater than the diameter of the disc hole and furthermore on a side which is more remote from the free end of the drive spindle together constitute an interrupted cylinder in the operating position, which cylinder has a transverse dimension equal to the diameter of the disc hole.
  • any imbalance in the video disc gives rise to centrifugal forces on the drive spindle, which should not lead to a radial and axial displacement of the disc.
  • the centrifugal forces which are exerted are taken up by the centering members and by friction forces as a result of the clamping forces between the disc loader and the disc and between the disc and the disc aligner.
  • the supporting surfaces of the disc aligner may consist of a material having a high coefficient of friction.
  • An embodiment of the invention is of importance which is characterized in that the resilient means for the centering members have a spring constant (which is defined as the quotient of the change in resilient force and the change in resilient depression), which upon a displacement of the centering means from the rest position into the operating position changes from smaller to greater. In this embodiment positioning a video disc is initially comparatively easy because of the smaller spring constant, while during operation a higher spring constant ensures that the alignment of the video disc is correct and the centrifugal forces are taken up.
  • each bar spring has a free end and that there are provided stop means on the drive spindle with which each of the bar springs cooperates near its free end, in a position situated between the rest position and the operating position, so as to obtain a stepwise change of the spring constant.
  • stop means on the drive spindle with which each of the bar springs cooperates near its free end, in a position situated between the rest position and the operating position, so as to obtain a stepwise change of the spring constant.
  • the transition from the one portion to the other portion of the spring characteristic may then coincide with the instant at which the spot is reached where during putting on of a video disc the transition appears between the conical portion and the cylindrical portion of the centering device.
  • the resilient means exert no axial force components on the video disc, the locally higher rigidity of the resilient means while putting on the video disc presents hardly any problems.
  • the centering device is mounted on the drive spindle as one unit which comprises the bar springs as well as a retaining ring which interconnects said springs and which is integral therewith.
  • the centering device is integrally manufactured from a plastics by an injection-moulding process.
  • an embodiment is of importance which is characterized in that the stop means comprise wall portions of a coaxial cylindrical stop member which is rigidly mounted on the drive spindle. This ensures an optimum centering accuracy.
  • FIG. 1 is a perspective view of a video disc player with open cover and equipped with an arrangement for centering aligning and retaining a video disc
  • FIG. 2 shows a detail of FIG. 1 on an enlarged scale
  • FIG. 3 is a partial cross-section over the drive spindle of the video disc in accordance with FIG. 1 when the cover is closed,
  • FIG. 4 is a cross-section of the centering device which is integrally manufactured from a plastic and which is employed in the embodiments shown in the preceding Figures,
  • FIGS. 5A, B and C show a detail of FIG. 3 on an enlarged scale, a video disc being disposed in different positions relative to a centering member in the various Figures, and
  • FIG. 6 represents a spring characteristic of a centering device in accordance with FIG. 4.
  • the video disc player 1 in FIG. 1 comprises a housing 2 and a hinged cover 3. At the front of the housing there are located a number of buttons 4 and 5 for the actuation of the various apparatus functions. At a central location there is disposed an arrangement 6 for centering, aligning and retaining a video disc 7, which disc has a disc hole 8. The disc can be placed on the arrangement 6 so as to be driven thereby with the required speed of 1500 or 1800 revolutions per minute, depending on whether the power line frequency is 50 or 60 Hertz.
  • a radially extending slot 9 is formed in the upper surface of the housing 2, in which a focussing device 10 is movable in a radial direction with the aid of means, not shown, which are accommodated in the housing.
  • Said device comprises an objective 11 by means of which a light beam from a laser source, not shown, can be focussed onto the lower surface of a disc which is disposed on the arrangement 6, and with the aid of which the light reflected by the disc can be passed to photoelectric information detection means inside the housing 2.
  • a drive motor 12 see FIG. 3, has a drive spindle 14 which is rotatable about an axis of rotation 13.
  • the spindle has a slightly truncated free end 15. Near the free end 15 there is disposed a centering device 17 which in the operating position of the disc cooperates with the wall 16 of the central disc hole 8 of the video disc 7.
  • a disc aligner 18 having the shape of a flange is mounted on the drive spindle 14, for aligning the disc 7 in its operating position in a plane perpendicular to the axis of rotation 13 of the drive spindle 14.
  • the disc aligner 18 has a supporting surface for the video disc 7 in the form of a hard-rubber ring 20 which is disposed in an annular groove 19.
  • the cover 3 carries a disc loader 21 which is movable to a position opposite the centering device 17 and which in the operating position presses on the video disc 7 for loading the disc in the direction of the ring 20 of the disc aligner 18 and thus retaining said disc.
  • the disc loader 21 loosely engages the drive spindle 14 and cooperates with a disc-shaped permanent magnet 23 mounted on the drive spindle.
  • the cover 3 has a chamber 24 which receives a flange-shaped portion 25 of the disc loader with play, while a cylindrical portion 26 of the disc loader projects through an opening 27 of the chamber 24.
  • the permanent magnet 23 as well as the flange 18 are connected to a member 28 which has been shrunk on the drive spindle 14, and they are thus rigidly connected to the drive spindle.
  • the centering device 17 comprises a plurality of centering members 29 which are radially movable between a rest position (see FIG. 5A) and an operating position (see FIG. 5C) which is situated nearer the axis of rotation 13.
  • Said centering members take the form of bar springs, which are connected to the drive spindle with a fixed end and, together with a retaining ring 30, constitute a single component manufactured from a plastic by injection mounting, see FIG. 4.
  • a suitable material is for example polycarbonate with an addition of 1% silicon oil in order to reduce the coefficient of friction.
  • the centering members 29 are movable against their resilient action by cooperation with the wall 16 of the disc hole 8 in the video disc 7 when said disc is placed onto the drive spindle.
  • the bar springs 29 have a kinked shape at least at their sides which are remote from the axis of rotation 13 of the drive spindle 14, so that in the rest position at their sides nearer the free end of the drive spindle the bar springs together constitute an interrupted truncated cone which has a transverse dimension which varies from smaller than to greater than the diameter of the disc hole 8 of the video disc 7 and in the operating position at their sides which are more remote from the free end 15 of the drive spindle constitute an interrupted cylinder with a transverse dimension equal to the disc-hole diameter. This will be explained hereinafter with reference to FIGS. 5A to 5C.
  • the centering members 29 have a spring constant which during the movement of the centering means from the rest position into the operating position changes from smaller to greater.
  • FIGS. 5A to 5C show how a centering member 29 is moved from its rest position to its operating position when the video disc 7 is put on.
  • Each of the centering members has a fixed end 31 which is connected to the retaining ring 30 and a free end 32 on the opposite side. This free end is hook-shaped and engages with a stop means 33 which forms part of the member 28 which has been shrunk onto the drive spindle 14.
  • FIG. 5A represents the situation in which the wall 16 of the disc hole 8 of the video disc 7 just contacts the portion 34 of the centering member 29 in that the video disc is moved downwards in the direction of the arrow D.
  • the portions 34 together constitute the previously mentioned interrupted cone.
  • FIG. 6 shows how a pivotal force F acting on the centering member 29 in the direction of the axis of rotation 13 varies between the situations represented in FIGS. 5A and 5B.
  • the force F is obviously zero.
  • point B the situation of FIG. 5B is obtained and the force is 0.3 Newtons after a displacement d of 75 microns.
  • the spring constant which is defined as the quotient of the force F in Newtons divided by the displacement d in microns, equals tan ⁇ over the entire path between points A and B.
  • a correct centering of the disc on the centering device is obtained by the cooperation of the wall 16 with the portion 36 of the centering members 29, said interrupted cylindrical surface being concentrically disposed relative to the axis of rotation 13.
  • the accuracy of this concentricity is promoted by the cylindrical shape of the stop means 33, which constitutes a cylindrical stop member, which is rigidly and coaxially mounted on the drive spindle, for all centering members 29.
US05/972,603 1978-06-05 1978-12-22 Arrangement for centering, aligning and retaining a rotating record Expired - Lifetime US4218065A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NLAANVRAGE7806072,A NL182032C (nl) 1978-06-05 1978-06-05 Inrichting voor het centreren, richten en vastklemmen van een roterende plaat.
NL7806072 1978-06-05

Publications (1)

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US4218065A true US4218065A (en) 1980-08-19

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US05/972,603 Expired - Lifetime US4218065A (en) 1978-06-05 1978-12-22 Arrangement for centering, aligning and retaining a rotating record

Country Status (19)

Country Link
US (1) US4218065A (fr)
JP (1) JPS5927028B2 (fr)
AR (1) AR215807A1 (fr)
AT (1) AT364544B (fr)
AU (1) AU521702B2 (fr)
BR (1) BR7903507A (fr)
CA (1) CA1135849A (fr)
CH (1) CH648143A5 (fr)
DD (1) DD144138A5 (fr)
DE (1) DE2921410C3 (fr)
DK (1) DK230879A (fr)
ES (1) ES481226A1 (fr)
FR (1) FR2428296A1 (fr)
GB (1) GB2023768B (fr)
IT (1) IT1121233B (fr)
NL (1) NL182032C (fr)
NZ (1) NZ190624A (fr)
SE (1) SE443467B (fr)
ZA (1) ZA792243B (fr)

Cited By (19)

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Publication number Priority date Publication date Assignee Title
US4351047A (en) * 1979-10-02 1982-09-21 Licentia Patent-Verwaltungs-G.M.B.H. Centering of a disc-shaped record carrier on a turntable
US4387454A (en) * 1980-03-31 1983-06-07 Victor Company Of Japan, Ltd. Disc-shaped recording medium reproducing apparatus
US4538253A (en) * 1983-08-12 1985-08-27 Pioneer Electronic Corporation Disc playing system with continuous playing function
US4539663A (en) * 1983-08-12 1985-09-03 Pioneer Electronic Corporation Disc playing system with continuous playing function
US4570194A (en) * 1982-02-09 1986-02-11 Staar S.A. Disc player having self-actuated magnetic clamping device
US4587647A (en) * 1983-02-28 1986-05-06 Xerox Corporation Media spindle clamp for disk drives utilizing removable recording media
US4594700A (en) * 1981-05-02 1986-06-10 Pioneer Electronic Corporation Automatic disc player system with disc selecting and loading means
US4649531A (en) * 1984-11-26 1987-03-10 U.S. Philips Corporation Apparatus for centering, aligning and clamping an optical disc
US4726007A (en) * 1986-07-03 1988-02-16 Mccormack Steven A Compact disc damper and method
US4737948A (en) * 1984-07-31 1988-04-12 Alps Electric Co., Ltd. Disk clamp device
US4768185A (en) * 1982-05-27 1988-08-30 U.S. Philips Corporation Optical-disc apparatus
US4783777A (en) * 1985-12-20 1988-11-08 U.S. Philips Corporation Disc player
US4827364A (en) * 1984-04-30 1989-05-02 Xerox Corporation Self-compensating media centering and clamping mechanism for floppy disk drives
US4910624A (en) * 1986-12-01 1990-03-20 U.S. Philips Corporation Optically readable disk with self centering hub
US5633856A (en) * 1992-01-24 1997-05-27 Sony Corporation Disc table for disc recording/reproducing apparatus and method for producing same
EP1050878A1 (fr) * 1999-04-09 2000-11-08 Hewlett-Packard Company Serrage automatique de disques compacts
US20070050784A1 (en) * 2005-08-22 2007-03-01 Funai Electric Co., Ltd. Optical disk drive
US20080053620A1 (en) * 2003-08-22 2008-03-06 Oc Oerlikon Balzers Ag Method for the bonding of disk-shaped substrates and apparatus for carrying out the method
US20130014132A1 (en) * 2011-07-08 2013-01-10 Panasonic Corporation Optical disk device

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NL7908859A (nl) * 1979-12-10 1981-07-01 Philips Nv Systeem voor het inschrijven en/of uitlezen van informatie.
JPS57114573U (fr) * 1980-12-27 1982-07-15
JPS57191997U (fr) * 1981-05-29 1982-12-06
IE53068B1 (en) * 1981-06-15 1988-05-25 Merck & Co Inc Diamino isothiazole-1-oxides and -1,1-dioxides as gastic secretion inhibitors
JPS5849387U (ja) * 1981-09-28 1983-04-02 オンキヨー株式会社 デイスク押え装置
JPS5849385U (ja) * 1981-09-28 1983-04-02 オンキヨー株式会社 デイスク押え装置
DE3147324A1 (de) * 1981-11-28 1983-06-01 Basf Ag, 6700 Ludwigshafen Laufwerk fuer flexible aufzeichnungstraeger mit zentraler einspannoeffnung
DE3211358C2 (de) * 1982-03-27 1984-01-05 Philips Patentverwaltung Gmbh, 2000 Hamburg Vorrichtung zum Auflegen eines plattenförmigen, starren Informationsträgers an einem Plattenspielgerät
DE3211361C1 (de) * 1982-03-27 1983-05-19 Philips Patentverwaltung Gmbh, 2000 Hamburg Plattenklemmvorrichtung
DE3211360C2 (de) * 1982-03-27 1984-01-05 Philips Patentverwaltung Gmbh, 2000 Hamburg Plattenklemmvorrichtung
EP0090459B1 (fr) * 1982-03-27 1985-07-03 Philips Patentverwaltung GmbH Tourne-disque
EP0090458B1 (fr) * 1982-03-27 1985-03-27 Philips Patentverwaltung GmbH Tourne-disque pour un disque rigide support d'informations
JPS58218069A (ja) * 1982-06-11 1983-12-19 Victor Co Of Japan Ltd 回転記録媒体再生装置
US4539671A (en) * 1982-09-24 1985-09-03 Sony Corporation Recording and/or reproducing apparatus for a disk
US4479210A (en) * 1982-11-19 1984-10-23 U.S. Philips Corporation Record-disc player
NL8300731A (nl) * 1983-02-28 1984-09-17 Philips Nv Platenspeler met een remmechanisme voor het afremmen van een plaat.
JPH0313898Y2 (fr) * 1984-12-19 1991-03-28
JPH0418103Y2 (fr) * 1985-06-05 1992-04-22
NL8503523A (nl) * 1985-12-20 1987-07-16 Philips Nv Inrichting voor het centreren van een tijdens bedrijf roterende plaat.
NL9101846A (nl) * 1991-11-05 1993-06-01 Jong Dirk De Compactdiskpakker.

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US3768815A (en) * 1972-06-21 1973-10-30 Ibm Apparatus for clamping and centering a flexible magnetic disk
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NL182594C (nl) * 1975-03-12 1988-04-05 Philips Nv Afspeelinrichting, in het bijzonder videospeler, voor het afspelen van een van een centraal gat voorziene uit transparant materiaal vervaardigde plaat, alsmede aanpassingsplaat ten gebruike bij deze inrichting.
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351047A (en) * 1979-10-02 1982-09-21 Licentia Patent-Verwaltungs-G.M.B.H. Centering of a disc-shaped record carrier on a turntable
US4387454A (en) * 1980-03-31 1983-06-07 Victor Company Of Japan, Ltd. Disc-shaped recording medium reproducing apparatus
US4594700A (en) * 1981-05-02 1986-06-10 Pioneer Electronic Corporation Automatic disc player system with disc selecting and loading means
US4570194A (en) * 1982-02-09 1986-02-11 Staar S.A. Disc player having self-actuated magnetic clamping device
US4768185A (en) * 1982-05-27 1988-08-30 U.S. Philips Corporation Optical-disc apparatus
US4587647A (en) * 1983-02-28 1986-05-06 Xerox Corporation Media spindle clamp for disk drives utilizing removable recording media
US4539663A (en) * 1983-08-12 1985-09-03 Pioneer Electronic Corporation Disc playing system with continuous playing function
US4538253A (en) * 1983-08-12 1985-08-27 Pioneer Electronic Corporation Disc playing system with continuous playing function
US4827364A (en) * 1984-04-30 1989-05-02 Xerox Corporation Self-compensating media centering and clamping mechanism for floppy disk drives
US4737948A (en) * 1984-07-31 1988-04-12 Alps Electric Co., Ltd. Disk clamp device
US4649531A (en) * 1984-11-26 1987-03-10 U.S. Philips Corporation Apparatus for centering, aligning and clamping an optical disc
US4783777A (en) * 1985-12-20 1988-11-08 U.S. Philips Corporation Disc player
US4726007A (en) * 1986-07-03 1988-02-16 Mccormack Steven A Compact disc damper and method
US4910624A (en) * 1986-12-01 1990-03-20 U.S. Philips Corporation Optically readable disk with self centering hub
US5633856A (en) * 1992-01-24 1997-05-27 Sony Corporation Disc table for disc recording/reproducing apparatus and method for producing same
EP1050878A1 (fr) * 1999-04-09 2000-11-08 Hewlett-Packard Company Serrage automatique de disques compacts
US6252843B1 (en) 1999-04-09 2001-06-26 Hewlett Packard Company Automatic clamping of compact discs
US20080053620A1 (en) * 2003-08-22 2008-03-06 Oc Oerlikon Balzers Ag Method for the bonding of disk-shaped substrates and apparatus for carrying out the method
US20070050784A1 (en) * 2005-08-22 2007-03-01 Funai Electric Co., Ltd. Optical disk drive
EP1783762A3 (fr) * 2005-08-22 2009-01-07 Funai Electric Co., Ltd. Lecteur de disque optique
US20130014132A1 (en) * 2011-07-08 2013-01-10 Panasonic Corporation Optical disk device

Also Published As

Publication number Publication date
DE2921410B2 (de) 1981-03-19
IT1121233B (it) 1986-03-26
DK230879A (da) 1979-12-06
NL7806072A (nl) 1979-12-07
GB2023768B (en) 1982-07-14
DE2921410C3 (de) 1981-12-03
DE2921410A1 (de) 1979-12-06
JPS5927028B2 (ja) 1984-07-03
AU521702B2 (en) 1982-04-22
GB2023768A (en) 1980-01-03
AR215807A1 (es) 1979-10-31
DD144138A5 (de) 1980-09-24
ES481226A1 (es) 1980-02-01
ZA792243B (en) 1980-12-31
NZ190624A (en) 1982-03-30
SE7904827L (sv) 1979-12-06
FR2428296A1 (fr) 1980-01-04
JPS54159202A (en) 1979-12-15
SE443467B (sv) 1986-02-24
IT7923212A0 (it) 1979-06-01
ATA402179A (de) 1981-03-15
BR7903507A (pt) 1980-01-22
CA1135849A (fr) 1982-11-16
AU4770879A (en) 1979-12-13
CH648143A5 (de) 1985-02-28
FR2428296B1 (fr) 1984-11-09
AT364544B (de) 1981-10-27
NL182032C (nl) 1987-12-16
NL182032B (nl) 1987-07-16

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